SystemAir fantech ECHO 2800Xi Series, Installation, Operation And Maintenance Manual, Page: 11 / 19

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The schedules are set to inactive (00:00 – 00:00 Monday to Sunday & holidays) from the factory. If it is intended to have the unit
operated by schedules then they have to be programmed in the field. Once the airflow set points, the time/date and the schedules have
been programed, the unit will start up and operate at the given airflow set point when a schedule is active. If it is intended to have the unit
operate at normal speed constantly for a given day then set the period 1 of the normal speed schedule for that day to 00:00 – 24:00. If all
week days are set to 00:00 – 24:00 the unit will run continuously, year round. The same can be done with the reduced speed schedule but
keep in mind that the normal speed schedule has precedence over the reduced one.
Holiday periods can be programmed and set to be active or inactive in the normal or reduced speed schedules. Set the day of which month a holiday
period starts followed by the day of which month it ends (i.e. 12-25 – 12-26 for December 25 to December 26 or 01-01 – 01-01 for January 1).
Once holiday periods have been set, access the schedules to set the holiday run time. To program the holiday periods follow the steps below.
1 Holiday
Access the holiday submenu from the time settings menu. Press the OK
button to access the fields, use the arrow buttons to set a value and
press OK again to save the value. Up to 24 holiday periods can be set for
a year.
Holidays (mm:dd)
1: mm-dd - mm-dd
2: mm-dd - mm-dd
3: mm-dd - mm-dd
If the outdoor air temperature falls below the frost threshold of the unit the exchanger defrost function will be triggered and the unit will cycle between
ventilation and the selected defrost mode in order to prevent any frost build up within the unit.
Exchanger defrost
1 Configuration
Go to
Configuration
by using the UP/DOWN arrow buttons. Select by
pressing the RIGHT arrow button
Manual/Auto
Settings
→Configuration
Access rights
3 Exchanger frost prevention
From this submenu, press the OK button to access the fields. Ensure the
Mode
is set to
On
and the
Type
is set to
Recirculation
by using
the arrow buttons to set a value and press OK again to save the value.
Mode
On
Type
Recirculation
If a BPM module has been installed on the unit, the recirculation operation mode can be made available. It can be configured to run via a digital input
and/or a schedule. When recirculation is activated, the exhaust air fan will stop, the BPM module will close the path to the outdoor air and open the
path to the indoor recirculation air and the supply air fan will recirculate air throughout the space. This can be done when ventilation is not required
during a certain period but air circulation is desired.
Recirculation (units equipped with the BPM module only)
To have the recirculation mode controlled by a digital input, the input will have to be configured first. A means of triggering the input will also
be required (field supplied and specified) and wired to terminals TB3 71 & 4, DI1 & +24VDC respectively (see wiring diagram).
Remember to cut the power to the unit at the all pole circuit breaker before performing any electrical work. The recirculation digital input has
precedence over the normal & reduced speed schedules. If any stop condition is met, the unit will stop even if the recirculation input is active.
To configure the recirculation digital input, after the means of triggering the input has been wired, follow the steps below.
1 Configuration
Go to
Configuration
by using the UP/DOWN arrow buttons. Select by
pressing the RIGHT arrow button
Manual/Auto
Settings
→Configuration
Access rights
2 Inputs/Outputs
Locate Inputs/Outputs submenu by using the UP/DOWN arrow
buttons and select it by pressing the RIGHT arrow button
→Inputs/Outputs
Sensor settings
Control function
Fan control
Time settings & schedule (Cont'd)
Unit operation (Cont'd)
Exchanger defrost (Cont'd)
Unit operation (Cont'd)
3 DI
Go to
DI
by using the UP/DOWN arrow buttons. Select by pressing the
RIGHT arrow button
AI
→DI
UI
AO
During exhaust only defrost, the supply fan will shut down and the outdoor air damper (if equipped) will close (interruption of the cold outdoor airflow).
The unit will keep extracting warm air for a defined period of time preventing any frost build up before going back to normal ventilation mode. This
mode of defrost is configured from the factory and available on every unit by default.
If a BPM module has been installed on the unit, the option of recirculation defrost is available. During recirculation defrost, the motorized damper on
the module will temporarily block the incoming outdoor air stream and open a path to circulate warm air from the building through the HRV/ERV. The
exhaust fan shuts down and the supply fan will circulate warm air for a defined period of time to prevent any frost build up before going back to normal
ventilation mode.
To configure the recirculation defrost for a unit equipped with the BPM module follow the steps below.
Exchanger defrost sequece (exhaust only defrost and reciculation defrost)
Defrost Stage Outdoor air temperature Defrost run time/ Normal run time (min)
1 ≤ 23 oF (-5 oC) 5/40
2 ≤ 14 oF (-10 oC) 5/35
3 ≤ 5 oF (-15 oC) 5/30
4 ≤ -4 oF (-20oC) 5/25
2 Exchanger frost prevention
Go to
Exchanger
frost prevention by using the UP/DOWN arrow
buttons. Select by pressing the RIGHT arrow button
Exchanger deicing
→Exchanger frost pre
Cooling recovery
Enthalpy control